From 1479d6933b417e26bf49f39d2b6de3ccee84a600 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Wed, 31 Jul 2013 00:32:48 +0200
Subject: [PATCH] Prevent admesh to reverse all facets twice in some
 mostly-random situations. Normalizing a null normal should still return a
 null normal in order to fix it properly later instead of treating it as if it
 was a true normal and thus reversing the facet (and if that is the first
 facet, all of the others would be reversed as well). #1362

---
 xs/src/admesh/normals.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xs/src/admesh/normals.c b/xs/src/admesh/normals.c
index bbba99e35..f827a712c 100644
--- a/xs/src/admesh/normals.c
+++ b/xs/src/admesh/normals.c
@@ -359,7 +359,7 @@ void stl_normalize_vector(float v[])
   min_normal_length = 0.000000000001;
   if(length < min_normal_length)
     {
-      v[0] = 1.0;
+      v[0] = 0.0;
       v[1] = 0.0;
       v[2] = 0.0;
       return;